Effect of the synthesis conditions on the structural, morphological and optical properties of Bi2Te2.7Se0.3 nanoparticles
Effect of the synthesis conditions on the structural, morphological and optical properties of Bi2Te2.7Se0.3 nanoparticles
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DOI：
10.1016/j.ijleo.2017.12.090
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发表时间：
2018-01-01
期刊：
影响因子：
3.1
通讯作者：
Mohamed, M. A. A.
中科院分区：
文献类型：
--
作者：
Ali, H. M.;Ibrahim, E. M. M.;Mohamed, M. A. A.
除了作为热电发电机的前景广阔的用途外，Bi2Te3 和相关化合物在电子和光电设备中也有多种应用。在这项工作中，通过物理气相沉积技术在不同的流速和温度条件下成功制备了Bi2Te2.7Se0.3纳米粒子（NPs）。 X射线衍射图表明，纳米颗粒以菱形晶体结构结晶，并沿(015)面生长良好。场发射扫描电子显微镜（FE-SEM）研究表明，纳米粒子的尺寸显着取决于流量和温度的合成条件，随着前者的减小或后者的增加，纳米粒子的尺寸减小。沉积条件对最终形态的影响可以通过热区中气态前体浓度的伴随变化来解释。使用 Kubelka-Munk 理论研究了光学特性。不同条件下合成的样品的光学带隙分别为0.52.0.58、0.53 eV。 (C) 2017 爱思唯尔有限公司。版权所有。
Beside their promising utility as thermoelectric generators,Bi2Te3 and related compounds have several applications in electronic and optoelectronic devices. In this work, Bi2Te2.7Se0.3 nanoparticles (NPs) were successfully prepared via physical vapor deposition technique at different conditions of flow rate and temperature. The x-ray diffraction patterns show that, the NPs crystallize in a rhombohedral crystal structure with preferable growth along the (015) plane. Field-emission scanning electron microscope (FE-SEM) investigation shows that the NPs size depends significantly on the synthesis conditions of flow rate and temperature where it decreases with the decrease in the former or with the increase in the later. The effect of deposition conditions on the final morphology can be interpreted through the accompanied variation in the concentration of the gaseous precursors in the hot zone. The optical properties were studied using Kubelka-Munk theory. Optical band gaps of 0.52.0.58, 0.53 eV were determined for the samples synthesized under different conditions. (C) 2017 Elsevier GmbH. All rights reserved.